AVR^® DD Microcontrollers (MCUs)

The Clock Failure Detect (CFD) is a system supervisory circuit that will switch over to the internal clock if the external crystal fails (stops). This additional safety level allows the device to run on a very precise clock. If the crystal fails, the device automatically switches to a secondary internal clock source and generates an interrupt to notify the main application that the external crystal has stopped. The user can then determine if the application needs to stop or go into a safe mode.

The Custom Logic peripheral is a programmable logic peripheral that can be connected to the device pins, events or other internal peripherals. Each Lookup Table (LUT) consists of three inputs: a truth table, an optional synchronizer and a filter and edge detector. An LUT can generate an output to be routed internally or to an I/O pin, which eliminates the need for external logic and reduces BOM cost.

The Event System allows peripherals to communicate directly with each other without involving the CPU or bus resources. This means that different triggers at the peripheral level can result in an event, such as a timer’s interrupts triggering an action in another peripheral. The Event System has three independent channels for direct peripheral-to-peripheral signaling. This deterministic signaling method is a perfect fit for real-time applications. The events are handled at the peripheral level even if the CPU is occupied handling interrupts or in sleep mode.

The on-board 12-bit, 130 ksps differential Analog-to-Digital Converter (ADC) features selectable internal voltage references with minimal temperature drift. Using the Event System, the on-board Analog Comparator (AC) can be connected to trigger autonomous operation in other peripherals, which is ideal for real-time control and closed-loop operations. The output of the 10-bit Digital-to-Analog Converter (DAC) can either be sent to a pin or it can be used to generate an adjustable reference voltage for the AC.

The Clock Failure Detect (CFD) is a system supervisory circuit that will switch over to the internal clock if the external crystal fails (stops). This additional safety level allows the device to run on a very precise clock. If the crystal fails, the device automatically switches to a secondary internal clock source and generates an interrupt to notify the main application that the external crystal has stopped. The user can then determine if the application needs to stop or go into a safe mode.

The Custom Logic peripheral is a programmable logic peripheral that can be connected to the device pins, events or other internal peripherals. Each Lookup Table (LUT) consists of three inputs: a truth table, an optional synchronizer and a filter and edge detector. An LUT can generate an output to be routed internally or to an I/O pin, which eliminates the need for external logic and reduces BOM cost.

The Event System allows peripherals to communicate directly with each other without involving the CPU or bus resources. This means that different triggers at the peripheral level can result in an event, such as a timer’s interrupts triggering an action in another peripheral. The Event System has three independent channels for direct peripheral-to-peripheral signaling. This deterministic signaling method is a perfect fit for real-time applications. The events are handled at the peripheral level even if the CPU is occupied handling interrupts or in sleep mode.